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Matt, UV-stable, Thermoformable, co-extruded polyester film, a method for the production thereof and the use of the same

a technology of thermoformable and thermoformable films, which is applied in the field of thermoformable and thermoformable co-extruded polyester films, which can solve the problems of particle impairing transparency and does not provide any proposal as to how the uv resistance of these films may be improved

Inactive Publication Date: 2005-03-29
MITSUBISHI POLYESTER FILM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particles impair transparency.
That specification does not, however, provide any proposal as to how the UV resistance of these films may be improved.

Method used

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  • Matt, UV-stable, Thermoformable, co-extruded polyester film, a method for the production thereof and the use of the same
  • Matt, UV-stable, Thermoformable, co-extruded polyester film, a method for the production thereof and the use of the same
  • Matt, UV-stable, Thermoformable, co-extruded polyester film, a method for the production thereof and the use of the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

a) Preparation of component II for the outer layer mixture of the invention.

A copolyester containing about 90 mol % of isophthalic acid and 10 mol % of the sodium salt of 5-sulfoisophthalic acid, as acid component, and 100 mol % of ethylene glycol, as glycol component, was prepared by the following method:

A stainless-steel reaction vessel of 2 l capacity, equipped with an anchor stirrer, a thermal element for measuring the temperature of the vessel contents, an 18-inch Claisen / Vigreux distillation column with condenser and receiving vessel, an inlet opening and a heating jacket, was preheated to 190° C. and flushed with nitrogen. 1065.6 g of dimethyl isophthalate, 180.6 g of the sodium salt of dimethyl 5-sulfoisophthalate and 756.9 g of ethylene glycol were placed in the vessel. A buffer (Na2CO3.10H2O-0.439 g) and a transesterification catalyst (Mn(OAc)2.4H2O-0.563 g, Ac=Acetate) were also placed in the vessel. The mixture was heated with stirring, whereupon methanol distilled off. ...

example 2

Using a method based on example 1, a three-layer film of total thickness 12 μm was produced by coextrusion. Only the composition of the outer layer A was changed:

Outer Layer A:

70% by weight of component I

20% by weight of component II, and

10% by weight of UV masterbatch.

example 3

A coextruded film with the specification of example 1, the composition of the outer layer A being as follows:

65% by weight of component I

25% by weight of component II, and

10% by weight of UV masterbatch.

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Abstract

The invention relates to biaxially oriented, co-extruded polyester films. Said films comprise a base layer which consists of at least 70% by weight of a thermoplastic polyester, preferably polyethylene terephthalate (PET) with a diethylene glycol and / or polyethylene glycol content greater than 1.3% by weight and have at least one matt outer layer and optionally additional intermediate layers. The films also contain at least one UV-absorber, preferably hydroxy benzotriazoles and triazines. The films are characterized by high UV-stability, no embrittlement after exposure to temperature, a matt surface devoid of unwanted clouding and excellent thermoforming properties and are, together with the molded bodies produced therefrom, suitable for numerous interior and exterior applications. The (matt) outer layers can be identical or different and contain a mixture or a blend of a component I which consists of PET homopolymers and / or copolymers and a component II which is a copolymer resulting from the condensation product of isophthalic acid, an aliphatic dicarboxylic acid and a sulfomonomer with a copolymerizable aliphatic or cycloaliphatic glycol.

Description

The invention relates to a biaxially oriented polyester film which has a base layer preferably composed of at least 70% by weight of a thermoplastic polyester and which is thermoformable, and comprises at least one UV absorber, and has at least one matt outer layer which comprises a mixture or a blend made from two components I and II. The invention further relates to the use of the film and to a process for its production.Component I of the mixture or of the blend is preferably a polyethylene terephthalate homopolymer or polyethylene terephthalate copolymer or a mixture made from polyethylene terephthalate homo- and / or copolymers.Component II of the mixture or of the blend is a polyethylene terephthalate copolymer which is composed of the condensation product of the following monomers or of their derivatives capable of forming polyesters: isophthalic acid, aliphatic dicarboxylic acid, sulfomonomer which contains a metal sulfonate group on the aromatic moiety of an aromatic dicarbox...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B32B27/18B32B27/36C08L67/02C08L67/00B29C47/06B29K67/00C08K5/3467
CPCB32B27/18B32B27/36C08L67/02Y10S428/91C08L2666/18Y10T428/31786B32B2250/40B32B2307/738B32B2307/408B32B2307/71B32B27/08B32B2367/00
Inventor MURSCHALL, URSULAKERN, ULRICHCRASS, GUENTHER
Owner MITSUBISHI POLYESTER FILM
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